JP2001145388A - Control system of wire-wound motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide two operation modes which are a manual operation mode wherein the resistance of the secondary variable resistors are adjusted and an automatic operation mode wherein the motor is automatically operated by an inverter. SOLUTION: A means 25 with which a power supply 2 is connected to the primary side of a wire-wound motor 21, means 26 and 27 with which a frequency/voltage variable inverter 24 is connected to the primary side of the motor 21, and a means 28 by which leads wires 34 with which the carbon brushes 21-2 of the secondary side of the motor are connected to secondary variable resistors 22 are short-circuited and opened, are provided. A means 6 which outputs a command of switching the operation is connected to a means 23 which controls the means 25, 26, 27 and 28. If the manual operation is commanded by the operation switching means, the control means connects the power supply directly to the motor and opens the short-circuiting/opening means to turn on the secondary variable resistors whose values are manually adjusted to start the motor and control the revolution of the motor. If the automatic operation is commanded by the operation switching means, the control means connects the inverter to the motor and switches the operation to the automatic operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention adjusts the resistance value of a secondary variable resistor connected to the secondary side of a wire-wound motor via a slip ring and a carbon brush to start and control the speed of the wire-wound motor. There are two types of operation: a winding type motor that performs manual operation by adjusting the resistance value of the secondary variable resistor as it is, and a system that connects an inverter to the primary side and short-circuits the secondary side to automatically operate by the inverter. The present invention relates to a control method of a wound-type motor improved so as to be able to perform.

[0002]

2. Description of the Related Art A conventional winding type motor control method is, for example, a winding type motor used as a crane winding up / down, traveling / traversing motor as in the conventional example of JP-B-63-34114. The resistance value of the secondary variable resistor connected to the secondary side via a slip ring and a carbon brush requires skill, but the driver manually adjusts the resistance value to start and control the speed of these wound motors. In general, when a person is busy during the day, the operator in the cage, which is the operator's cab of the crane, and a worker on the ground confirm safety, and for example, the traveling speed of the crane is 100 m / m. m
The work was done swiftly, for example, as quickly as possible.

In addition, a speed control method for driving an electric motor by an inverter is widely used.
As disclosed in Japanese Patent No. 34114, the secondary side of the wound motor is converted into a squirrel-cage induction motor by short-circuiting the lead wires of each phase connected to the slip ring between the lead wires. A variable voltage, variable frequency type inverter is newly connected between the primary side and the power source, and the speed of each induction motor is controlled by this inverter. As shown in Japanese Patent No. 2831221, There is an inverter that drives an electric motor for hoisting, traversing and traveling of an overhead crane, and a speed controller that outputs a speed signal that enables stable operation particularly in a low speed region.

In order to control the electric hoist by radio, for example, as shown in Japanese Utility Model Application Laid-Open No. 5-26995, a no-load detector is provided on the main body of the electric hoist which drives an electric motor for traversing or running the electric hoist by an inverter, and a radio. When a command is issued by performing a driving operation with a radio control command device provided separately, the inverter will move the motor for traversing or traveling in the direction of movement of the command received by the radio control command device without load. If the detector detects a no-load condition, it supplies power at a frequency higher than the rating and rotates it.If it does not detect a no-load condition, it supplies power at a rated frequency and rotates it to reduce the operating time. Some of them have improved the efficiency and prevented the inverter from tripping due to erroneous double-speed operation under load.

[0005]

According to the conventional control method of the winding type electric motor, for example, in the case of a crane, a driver in a cage, which is a cab of the crane, when he is busy during the daytime,
While two workers on the ground can check the safety and operate the crane near the maximum speed, it has the merit of being able to perform work efficiently and work efficiently. And a ground worker are required, and the traveling speed of the crane is the maximum speed determined by a continuously rated resistor (for example, a traveling speed of 100 m).
/ Min), an operator on the ground was required for safety. In order to reduce the maximum speed, it is necessary to add a resistor and change the continuous rating. Even with a resistor having the changed continuous rating, 70% of the initial maximum speed (for example, a running speed of 70%) is used.
m / min), and cannot be reduced to less than 50% of the maximum speed desired for safety (for example, a running speed of 50 m / min). In addition, there has been no motor that has been automated in operation by adding inverter control to a wound-type motor.

[0006] Some motors other than the wound-type motor can be automated by a speed control method driven by an inverter. However, it is not possible to use both automatic operation and efficient manual operation. Also, in the example of Japanese Patent Publication No. 63-34114, the winding type motor is converted into a cage type induction motor to enable automatic operation by an inverter, but efficient operation cannot be performed manually as before the modification.

In an example in which an electric hoist is wirelessly operated, a traveling motor is driven by supplying power at a rated frequency or a frequency higher than the rated frequency by an inverter. In consideration of safety, it cannot be driven by supplying power of a frequency lower than the rated value. Neither of them can operate in two ways: automatic operation and efficient operation by manual operation.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a manual operation of a wound-type motor by means of a secondary variable resistor, an inverter on the primary side and a short-circuited squirrel-cage induction motor on the secondary side. And automatic operation by the inverter can be used.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention controls the startup and speed control of a winding type motor by adjusting the resistance value of a secondary variable resistor connected to the secondary side of the winding type motor via a slip ring and a carbon brush. In the control method of the wound motor, the switching means on the power supply side for connecting the power supply to the primary side of the wound motor and the switching means on the power supply side of the inverter for connecting the power supply via the variable frequency / voltage type inverter, and the motor side Secondary means for switching between short-circuit and open-circuit between the lead wires of each phase connecting the carbon brushes of each phase on the secondary side and the secondary variable resistor of the winding type electric motor. Side switching means, and control means for controlling these are connected to an inverter, each switching means, operation switching means for issuing a switching command for automatic operation and manual operation, and the like. Manual luck In the case of, the switching means on the power supply side is closed, the power supply to the winding type motor is turned on, the switching means on the motor side of the inverter is opened, the inverter is turned off for the winding type motor, and the power supply is switched directly to the secondary side. The switching means is opened, the secondary variable resistor is turned on, the secondary variable resistance is manually adjusted to control the start and speed control of the wound motor, and if the command of the operation switching means is automatic operation, By closing the switching means on the secondary side and short-circuiting the secondary variable resistor, the winding type motor has the function of a cage type motor, and the switching means on the power supply side is opened to turn off the power to the winding type motor. The switching means on the power supply side of the inverter and the switching means on the motor side are closed, and the winding type motor is controlled to switch to automatic operation by the inverter driving the winding type motor by turning the inverter ON. Assuming that can manual operation and two kinds of automatic operation operation of wound electric motor.

[0010] In addition, the winding type electric motor is used as a traveling motor of an electric crane, and each lead is connected to a lead wire of each phase connecting a secondary variable resistor with a carbon brush of each secondary side of the winding type electric motor. It shall be modified by connecting the secondary side switching means for switching between short-circuit and open-circuit between the lines, and the secondary variable resistor shall be arranged in the cage which is the cab of the electric crane, and the control means shall be When the command of the switching means is a manual operation, the switching means on the power supply side is closed and the power supply to the winding type motor is turned off.
N, the switching means on the motor side of the inverter is opened, the inverter is turned off and the power supply is switched on directly to the winding type motor, and the switching means on the secondary side is opened, the secondary variable resistor is turned on, and manual operation is performed in the cage. If the control is made so that the startup and speed control of the wire-wound electric motor can be performed by adjusting the secondary variable resistance in (2), the electric crane can be operated in two ways, a manual operation and an automatic operation.

The operation switching means issues a command to switch between cage operation which is manual operation and wireless operation which is automatic operation, and wireless operation signal transmitting means for transmitting a signal for wirelessly operating the electric crane is separately provided. The wireless driving signal receiving means is connected to the means, and the control means closes the switching means on the secondary side and short-circuits the secondary variable resistor when the operation switching means command is a wireless operation, so that the winding type electric motor is connected to the car. In addition to providing the function of the electric motor, the switching means on the power supply side is opened, the power supply to the wound electric motor is turned off, the switching means on the power supply side of the inverter and the electric motor side are closed, and the inverter is turned on for the electric motor. Switching to the inverter operation to drive the winding motor, and issuing the traveling operation command by the wireless operation signal transmitting means, receiving and controlling the traveling operation command by the wireless operation signal receiving means In accordance with the traveling operation command, the control means issues a control signal based on a preset automatic traveling pattern to the inverter to perform automatic operation by the inverter driving the winding type electric motor, and the instruction of the operation switching means causes the cage operation to be performed. In this case, the switching means on the power supply side is closed, the power supply to the winding type motor is turned on, the switching means on the motor side of the inverter is opened, the inverter is turned off for the winding type motor, and the power supply is switched on and the secondary side is switched on. If the switching means is opened, the secondary variable resistance is turned on, and the secondary variable resistance is manually adjusted in the cage to control the starting and speed control of the wire wound motor, the manual operation of the electric crane And two types of automatic operation by radio.

[0012] In the automatic operation, the maximum speed of the wound motor during automatic operation by the inverter is 30 to 60% of the maximum speed during manual operation in which the secondary variable resistance is adjusted.
It is preferable that the control is performed in accordance with an automatic traveling pattern arbitrarily set in advance within the range, and that two types of operations, a manual operation and an automatic operation, can be performed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block circuit diagram of a control method of a wire wound motor to which one embodiment of the present invention is applied, and FIG. 2 is a configuration diagram of an electric crane system using the control method of the wire wound motor. 1 and 2, reference numeral 1 denotes a common protection panel of the electric crane system, which includes a power supply 2 and control means for protecting the entire system. Reference numeral 4 denotes a cage as an operator's cab of the electric crane, and reference numeral 5 denotes a wireless operation signal transmitting means for transmitting a signal for wirelessly operating the separately provided electric crane. 6
Reference numeral denotes operation switching means for issuing a command to switch between cage operation, which is manual operation, and wireless operation, which is automatic operation. Reference numeral 10 denotes a hoisting hoisting control panel including a hoisting wound motor 11 and a secondary variable resistor 12 connected to the secondary side thereof via a slip ring and a carbon brush. 13 and the like.

Reference numeral 20 denotes a running wound electric motor 21 and a slip ring 21-1 and a carbon brush 21 on its secondary side.
A traveling control panel for the traveling unit, comprising a secondary variable resistor 22 and the like connected via the control unit 2 for controlling the traveling unit.
3, a variable frequency / voltage inverter 24, a power supply side switching means 25 for connecting the power supply 2 to the primary side of the winding type electric motor 21, and a power supply side of the inverter 24 for connecting the power supply 2 via the inverter 24. The switching means 26, the switching means 27 on the motor side, and the lead wires 34 of the respective phases connecting the carbon brushes 21-2 and the secondary variable resistors 22 of the respective phases on the secondary side of the wound motor 21 to the respective lead wires 34. Switching means 28 on the secondary side for switching between short-circuiting and opening, and a wireless operation signal receiving means 29 for receiving the wireless operation signal of the wireless operation signal transmitting means 5 in the control means 23; Protection panel 1
And the operation switching means 6 are connected.

Numeral 30 denotes a traversing control panel for a traversing section comprising a traversing wound motor 31 and a secondary variable resistor 32 connected to its secondary side via a slip ring and a carbon brush. Means 33 are provided. The hoisting control panel 10 at the upper part of the winding and the traversing control panel 30 at the traversing part are also connected to the common protection panel 1 and the operation switching means 6 like the control panel 20 at the traveling part.

Next, the operation of the circuit of this embodiment will be described. In the embodiment of the winding type electric motor 31 shown in FIG.
When the command from the operation switching unit 6 is a manual operation, the control unit 23 closes the switching unit 25 on the power supply side and closes the winding type electric motor 21.
Then, the power supply 2 is turned on, the switching means 27 on the motor side of the inverter 24 is opened, and the inverter 24
Is turned off, the power supply 2 is switched to the direct connection, the switching means 28 on the secondary side is opened, the secondary variable resistor 22 is turned on, and the secondary variable resistor 22 is manually adjusted to start up and speed up the wound motor 21. If the command of the operation switching means 6 is an automatic operation, the secondary-side switching means 28 is closed and the secondary variable resistor 22 is short-circuited, so that the winding-type motor 21 is switched to the squirrel-cage motor. In addition to having the function, the power supply side switching means 25 is opened, the power supply 2 is turned off for the wound motor 21, the power supply side switching means 26 and the motor side switching means 27 of the inverter 24 are closed, and the winding motor 21 is turned on. With the inverter 24 turned ON, the winding type electric motor 21
By controlling the operation to be switched to the automatic operation by the inverter 24 that drives the motor, two types of operations, a manual operation and an automatic operation, can be performed.

In the embodiment of the electric crane shown in FIG. 2, the operation switching means 6 issues a command for switching between cage operation which is manual operation and wireless operation which is automatic operation.
In the case of the wireless operation, the control means 23 closes the switching means 28 on the secondary side and short-circuits the secondary variable resistor 22 so that the winding-type motor 21 has the function of the squirrel-cage motor, The switching means 25 on the power supply side is opened, the power supply 2 is turned off for the wound motor 21, the switching means 26 on the power supply side and the switching means 27 on the motor side of the inverter 24 are closed, and the inverter 24 is wound on the wound motor 21. When the operation is switched to the operation of the inverter 24 for driving the linear motor 21 and the driving operation command is issued by the separately provided wireless driving signal transmitting means 5, the driving operation command is received by the wireless driving signal receiving means 29 and transmitted to the control means 23, The control means 23 outputs a control signal according to an automatic traveling pattern set in advance to the inverter 24 in accordance with the traveling operation command, and outputs the control signal to the inverter 24 which drives the wound motor 21. To perform the automatic operation, the operation switching means 6
Is the cage operation, the control means 23 closes the switching means 25 on the power supply side and turns on the power supply 2 to the winding type electric motor 21.
The switching means 27 on the motor side of the inverter 24 is opened, the inverter 24 is turned off for the winding type electric motor 21, and the power supply 2 is switched on, and the switching means 28 on the secondary side is opened to turn on the secondary variable resistor 22. As described above, the secondary variable resistor 22 is manually adjusted in the cage 4 so that the starting and the speed control of the wound motor 21 can be controlled. Can be driven.

Therefore, during automatic operation, the control means 23 sets the maximum speed of the wound motor 21 in automatic operation by the inverter 24 within the range of 30 to 60% of the maximum speed in manual operation in which the secondary variable resistor 22 is adjusted. Since it can be programmed to control according to an automatic driving pattern arbitrarily set in advance, when busy during the daytime, it is safe for the driver in the cage 4 that is the cab of the crane and the ground worker to be safe. The crane traveling speed was increased to, for example, 100 m / min by manual operation as a cage operation while performing the operation, so that work with good work efficiency could be performed skillfully. The operator alone can slow down the traveling speed of the crane to 50 m / min and perform two types of operation, wireless automatic operation, while ensuring safety.

[0019]

According to the present invention, the startup and speed control of the winding type motor are performed by adjusting the resistance value of the secondary variable resistor connected to the secondary side of the winding type motor via a slip ring and a carbon brush. In the control method of the wound motor, the switching means on the power supply side for connecting the power supply to the primary side of the winding type motor, the switching means on the power supply side of the inverter for connecting the power supply via the frequency / voltage variable type inverter, and the switching means on the motor side. A secondary side for connecting switching means and switching between short-circuit and open-circuit between the lead wires of each phase connecting the carbon brushes of each phase on the secondary side and the secondary variable resistor of the winding type motor. The switching means is connected to the control means for controlling these, and the inverter, each switching means, and the operation switching means for issuing a switching command for automatic operation and manual operation are connected. manual In the case of rotation, the switching means on the power supply side is closed, the power supply to the winding type motor is turned on, the switching means on the motor side of the inverter is opened, the inverter is turned off for the winding type motor, and the power supply is switched to the direct on state. Open the switching means on the side, turn on the secondary variable resistor, manually adjust the secondary variable resistance to control the start and speed control of the wound motor, and when the command of the operation switching means is automatic operation Closes the switching means on the secondary side and short-circuits the secondary variable resistor to make the winding type motor have the function of a cage type motor, and opens the switching means on the power supply side to turn off the power to the winding type motor. The switching means on the power supply side of the inverter and the switching means on the motor side are closed, and the winding type motor is switched to automatic operation by the inverter driving the winding type motor by turning the inverter ON. Since Gosuru, control method of wound electric motor that can manual operation and two kinds of automatic operation operation of wound electric motor can be provided.

In addition, a carbon brush of each phase on the secondary side of the winding type motor used as a traveling motor of the electric crane and a lead wire of each phase connecting the secondary variable resistor are short-circuited between the lead wires.・ The secondary switching means for switching the release is connected, the secondary variable resistor is arranged in the cage which is the cab of the electric crane, and the control means controls the operation switching means by manual operation. In the case of, the power is switched directly to the winding type motor, the secondary side switching means is opened, the secondary variable resistance is turned on, and the secondary variable resistance is manually adjusted in the cage and wound. Since the linear motor is controlled so as to be able to start and control the speed, it is possible to provide a control method of a winding type motor that can perform two types of operations, that is, a manual operation and an automatic operation of the electric crane.

The operation switching means issues a command to switch between cage operation, which is manual operation, and wireless operation, which is automatic operation. Wireless operation signal transmission means for transmitting a signal for wirelessly operating the electric crane is separately provided. The means is connected to a wireless operation signal receiving means, and when the operation switching means command is a wireless operation, the control means causes the winding type motor to have the function of a squirrel-cage motor, switches to the inverter operation, and transmits a wireless operation signal. When a driving operation command is issued by the means, the driving operation command is received by the wireless driving signal receiving means and transmitted to the control means, and the control means outputs a control signal according to a predetermined automatic driving pattern to the inverter according to the driving operation command. Automatic operation by the inverter that drives the winding type motor, and when the command of the operation switching means is cage operation,
The power was switched to the direct connection to the wound motor, and the secondary variable resistance was manually adjusted in the cage to control the start and speed control of the wound motor. During busy times, the operator in the cage and the worker on the ground should check the safety and operate the crane quickly by manual operation, which is cage operation, to perform work efficiently and efficiently. When the amount of work is small, such as at night, it is possible to reduce the number of workers and reduce the traveling speed of the crane alone to perform two types of operation, wireless automatic operation while ensuring safety. A linear motor control method can be provided.

The maximum speed of the wound motor during automatic operation by the inverter during automatic operation is 30 to 60% of the maximum speed during manual operation in which the secondary variable resistance is adjusted.
The control is performed according to the automatic driving pattern arbitrarily set in advance within the range, so when busy during the day, the driver in the cage and the ground worker confirm the safety while checking the safety The crane can be operated quickly and close to the maximum speed by manual operation, which enables efficient and efficient work.When the amount of work is small, such as at night, the number of workers is reduced and the crane travels alone. It is possible to provide a control method of a winding type motor in which the speed can be reduced to 30 to 60% of the maximum speed in the manual operation, and two types of operations can be performed by wireless automatic operation while ensuring safety.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of a control system of a winding type electric motor showing one embodiment of the present invention.

FIG. 2 is a configuration diagram of an electric crane system using the control method of the winding type electric motor.

[Explanation of symbols]

 2 power supply 4 cage 5 wireless operation signal transmitting means 6 operation switching means 21 wound motor 21-2 carbon brush 22 secondary variable resistor 23 control means 24 inverter 25, 26, 27, 28 switching means 29 wireless operation signal receiving means 34 lead line

Claims (4)

[Claims] The present invention relates to a winding type motor for starting and controlling the speed of a winding type motor by adjusting the resistance of a secondary variable resistor connected to a secondary side of the winding motor via a slip ring and a carbon brush. In the control system, a power source (2) is connected via a switching means (25) on the power source side for connecting a power source (2) to the primary side of the winding type electric motor (21) and a frequency / voltage variable type inverter (24). Inverter (2
4) The switching means (26) on the power supply side and the switching means (27) on the motor side are connected, and the carbon brushes (21-2) of each phase on the secondary side of the winding type motor (21) and the secondary variable resistor are connected. (2
2) The secondary-side switching means (28) for switching between short-circuit and open-circuit between the lead wires (34) is connected to the lead wire (34) of each phase connecting the phase 2), and control for controlling these is performed. Means (2
3) The inverter (24) and each switching means (25, 26,
27, 28) and operation switching means (6) for issuing a switching command between automatic operation and manual operation, and the like, and the control means (23)
When the command of the operation switching means (6) is a manual operation, the switching means (25) on the power supply side is closed and the winding type electric motor (2) is closed.
In 1), the power supply (2) is turned on, the switching means (27) on the motor side of the inverter (24) is opened, and the winding type motor (21) is opened.
In response to this, the inverter (24) is turned off to switch the power supply (2) to the direct connection, and the switching means (2
8) is opened, the secondary variable resistor (22) is turned on, and the secondary variable resistor (22) is manually adjusted to adjust the winding type motor (2).
If the command of the operation switching means (6) is an automatic operation, the secondary switching means (28) is closed and the secondary variable resistor (22) is closed. By short-circuiting, the winding type electric motor (21) has the function of a squirrel-cage electric motor, and the switching means (2
5) is opened, the power supply (2) is turned off for the winding type electric motor (21), and the switching means (2) on the power supply side of the inverter (24) is turned on.
6) and the switching means (27) on the motor side is closed, and the winding type motor (21) is controlled so as to turn on the inverter (24) to switch to the automatic operation by the inverter (24) for driving the winding type motor (21). A control method for a wound-type motor, wherein two types of operation, manual operation and automatic operation, can be performed. 2. The winding type electric motor (21) includes a carbon brush (21-2) and a secondary variable resistor (22) of each phase on a secondary side of a winding type electric motor used as a traveling motor of an electric crane. The lead wire (34) of each connected phase is connected to a secondary-side switching means (28) for switching between short-circuit and open-circuit between the lead wires (34), and is modified. The variable resistor (22) is disposed in a cage (4), which is an operator's cab of the electric crane, and the control means (23) controls the power supply side when the operation switching means (6) issues a manual operation. The switching means (25) is closed, the power supply (2) is turned on to the winding type electric motor (21), the switching means (27) on the motor side of the inverter (24) is opened, and the inverter (24) is connected to the winding type electric motor (21). To OFF and switch to the direct connection of the power supply (2), The secondary-side switching means (28) is opened, the secondary variable resistor (22) is turned on, and the secondary variable resistor (22) is manually adjusted in the cage (4) to adjust the winding type motor (21). 2. The control method according to claim 1, wherein the control is performed so that start-up and speed control can be performed, and two types of operations, a manual operation and an automatic operation, can be performed. 3. The operation switching means (6) issues a switching command between a cage operation which is a manual operation and a wireless operation which is an automatic operation, and a wireless operation signal transmitting means (a signal for transmitting a signal for wirelessly operating an electric crane). 5) is separately provided, a wireless operation signal receiving means (29) is connected to the control means (23), and the control means (23) is provided with the operation switching means (6).
If the command is wireless operation, the secondary side switching means (28)
Is closed and the secondary variable resistor (22) is short-circuited to make the wound-type electric motor (21) have the function of a squirrel-cage electric motor, and the switching means (25) on the power supply side is opened to open the wound-type electric motor (21). On the other hand, the power supply (2) is turned off, the switching means (26) on the power supply side of the inverter (24) and the switching means (27) on the motor side are closed, and the winding type motor (21) is turned on with the inverter (24) turned on. When the operation is switched to the inverter (24) driving the electric motor (21) and the traveling operation command is issued by the wireless operation signal transmitting means (5), the traveling operation command is received by the wireless operation signal receiving means (29) and the control means is controlled. (23), the control means (23) outputs a control signal according to a preset automatic traveling pattern to the inverter (24) in accordance with the traveling operation command, and drives the winding motor (21). To perform the automatic operation by 24),
When the command from the operation switching means (6) is cage operation, the switching means (25) on the power supply side is closed and the winding type electric motor (2) is closed.
In 1), the power supply (2) is turned on, the switching means (27) on the motor side of the inverter (24) is opened, and the winding type motor (21) is opened.
In response to this, the inverter (24) is turned off to switch the power supply (2) to the direct connection, the switching means (28) is opened, the secondary variable resistor (22) is turned on, and the switch (28) is manually operated in the cage (4). 3. The method according to claim 2, wherein the secondary variable resistor (22) is controlled so that startup and speed control of the wound motor (21) can be performed by adjusting the secondary variable resistor, and two types of operations, a manual operation and an automatic operation, can be performed. Control method for wound motor. 4. The maximum speed of the winding type electric motor (21) during automatic operation by the inverter (24) during automatic operation is controlled by the control means (23). 4. The wire-wound electric motor according to claim 1, wherein control is performed according to an automatic driving pattern arbitrarily set in advance within a range of 30 to 60% of the range, and two types of operation, manual operation and automatic operation, can be performed. Control method.